Thermoelectric signature of the chiral anomaly in Cd3As2

Zhenzhao Jia, Caizhen Li, Xinqi Li, Junren Shi, Zhimin Liao (), Dapeng Yu and Xiaosong Wu ()
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Zhenzhao Jia: State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Peking University
Caizhen Li: State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Peking University
Xinqi Li: State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Peking University
Junren Shi: International Center for Quantum Materials, Peking University
Zhimin Liao: State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Peking University
Dapeng Yu: State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Peking University
Xiaosong Wu: State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Peking University

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Discovery of Weyl semimetals has revived interest in Weyl fermions which has not been observed in high energy experiments. It now becomes possible to study, in solids, their exotic properties. Extensive photoemission spectroscopy and electrical resistivity experiments have been carried out. However, many other properties remain unexplored. Here we show the thermoelectric signature of the chiral anomaly of Weyl fermions in Cd3As2 under a magnetic field. We observe a strong quadratic suppression of the thermopower when the magnetic field is parallel to the temperature gradient. The quadratic coefficient is nearly twice of that for the electrical conductivity. The thermopower reverses its sign in high fields. We show that all these intriguing observations can be understood in terms of the chiral anomaly of Weyl fermions. Our results reveal the anomalous thermoelectric property of Weyl fermions and provide insight into the chiral anomaly.

Date: 2016
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DOI: 10.1038/ncomms13013

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